public class lianxi2_6{
   public static void main (String args[]){
     int [] a = {10,20,30,40},b [] ={{1,2},{4,5,6,7}};
     b[0] = a;
     b[0][1] = b[1][3];
     System.out.println(b[0][3]);
     System.out.println(a[1]);
  }
}
